package com.starbugs.wehcat.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;

/**
 * 日志切面
 * @author starbooks
 *
 * 1 @Aspect 作用是把当前类标识为一个切面供容器读取
 * 2 @Pointcut 建立一个切入点
 */
@Aspect
@Component
public class LogAspect {

  @Pointcut("execution(* com.starbugs.wehcat.controller.FirstController.first(..)) || execution(* com.starbugs.wehcat.controller.StudentController.*(..))")
  public void webLog(){

  }

  @Before("webLog()")
  public void deBefore(JoinPoint joinPoint) throws Throwable {
    // 接收到请求，记录请求内容
    ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request = attributes.getRequest();
    // 记录下请求内容
    System.out.println("URL : " + request.getRequestURL().toString());
    System.out.println("HTTP_METHOD : " + request.getMethod());
    System.out.println("IP : " + request.getRemoteAddr());
    System.out.println("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
    System.out.println("ARGS : " + Arrays.toString(joinPoint.getArgs()));
  }

  @AfterReturning(returning = "ret", pointcut = "webLog()")
  public void doAfterReturning(Object ret) throws Throwable {
    // 处理完请求，返回内容
    System.out.println("方法的返回值 : " + ret);
  }

  //后置异常通知

  @AfterThrowing("webLog()")
  public void throwss(JoinPoint jp){
    System.out.println("方法异常时执行.....");
  }

  //后置最终通知,final增强，不管是抛出异常或者正常退出都会执行

  @After("webLog()")
  public void after(JoinPoint jp){
    System.out.println("方法最后执行.....");
  }

  //环绕通知,环绕增强，相当于MethodInterceptor
  // @Around参数必须为ProceedingJoinPoin

  @Around("webLog()")
  public Object arround(ProceedingJoinPoint pjp) {
    System.out.println("方法环绕start.....");
    try {
      Object o =  pjp.proceed();
      System.out.println("方法环绕proceed，结果是 :" + o);
      return o;
    } catch (Throwable e) {
      e.printStackTrace();
      return null;
    }
  }
}